Rust program to print the current date-time according to RIO (Brazil) time-zone

Rust | Date & Time Example: Write a program to print the current date-time according to RIO (Brazil) time-zone.
Submitted by Nidhi, on November 09, 2021

Problem Solution:

In this program, we will get the current LOCAL date-time and convert it into UTC Time and then print the current date-time according to RIO(Brazil) time-zone.

Add Chrono date-time external library to your project

Create your project using the below command.
```
$cargo new datetime -bin
```
Goto the project folder cd datetime and edit Cargo.toml file.
```
$datetime>nano Cargo.toml
```
Then add dependency in Cargo.toml file
```
[dependencies]
chrono = "0.4"
```
After that, build your project using the below command
```
$datetime>cargo build
```
Then execute your project after modification in src/main.rs source file.
```
$datetime>cargo run
```

Program/Source Code:

The source code to print the current date-time according to RIO (Brazil) time-zone is given below. The given program is compiled and executed on UBUNTU 18.04 successfully.

// Rust program to print the current date-time 
// according to RIO(Brazil) time-zone

use chrono::{DateTime, FixedOffset, Local, Utc};

fn main() {
    let localTime = Local::now();
    let utcTime = DateTime::<Utc>::from_utc(localTime.naive_utc(), Utc);
    
    let rioTimezone = FixedOffset::west(2 * 3600);
    
    println!("Local time: {}", localTime);
    println!("UTC time: {}", utcTime);
    
    println!("Current time in RIO(Brazil): {}",utcTime.with_timezone(&rioTimezone));
}

Output:

$datetime> cargo run
   Compiling datetime v0.1.0 (/home/arvind/Desktop/rust/datetime)
    Finished dev [unoptimized + debuginfo] target(s) in 0.29s
     Running `target/debug/datetime`

Local time: 2021-10-30 09:12:53.266391074 -07:00
UTC time: 2021-10-30 16:12:53.266391074 UTC
Current time in RIO(Brazil): 2021-10-30 14:12:53.266391074 -02:00

Explanation:

In the above program, we imported the "Chrono" library to our project for performing date and time operations. We imported the Chrono library using the below line:

use chrono::Utc;

In the main() function, we got the current LOCAL date-time using the Local::now() method and converted it into UTC date-time using the from_utc() method. Then we converted the UTC time according to RIO (Brazil) time-zone and printed the result.